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Respiration covers total process of respiration in step wise manner. Respiration is an important metabolic especially catabolic process for all living organisms. Respiration is nothing but oxidation of food substances in to simpler molecules. Respiratory system is going to play an important role in the process of respiration. It also explains the entry of Air and how it reaches to the all body parts than which organ is involved in respiration. To perform Respiration various organs involved in it, such as nostrils, trachea and lungs. It describes the importance of alveoli in the transportation of O2 and CO2 during respiration.